Because Plug is a consumable item, it is Sale, so purchase. Planned for replacement at plug replacement. If you exchange for overseas Plug of OEM, select Japan quality plug which is easy to obtain. Let's do it with Torque if you do not want to destroy the Plug screw mountain on the Engine side. Even if I break the Screw mountain of Plug, I can do it by Plug exchange.
Since it reached 10000? With the same item in use, I exchanged it. * Iridium plugs 20000? Large Although there is an opinion that it is durable, think as myself as a regular consumable part * Performance which is not comparable with the standard product attached at the time of delivery. It is improvement of startability, acceleration and fuel economy. Although other companies also have the same product, NGK Brand can still have trust. Next time 20000? At replacement this product.